Lath-board.



S. M. FORD.

LATH BOARDx m-mcmwm min AUG. 19:.

Patented Apr. 18, 1916.

2 SHEETS SHEU Inventor @iiasfifl Ford 3y:

S. M. FORD.

LATH BOARD.

APPLICATION FILED was, 1915 1,180,125. Patented Apr. 18,1916.

2 SHEETSSHEET 2.

[nrerz'tar SILAS M. FORD, OF ST. PAUL, MINNESOTA.

LATE-BOARD.

1,1. sores.

Specification of Letters Patent Patented Apr. 18, 1916.

Application filed August 9, 1915. Serial No. 44.505.

"0 (-5. 3 ui/lwi-z it may concern:

lie it known that 1, Sims M. noun, a s citizen oi the hinted States, residing at bt.

iamscy and State of w from slipping.

To these ends the invention consists in the construction, eolnbinati nd arrangement of nuts hereinafter d cried and claimed.

11 the accompanying drawings forming part of this specification, Figure 1 is a per spective view of the outer side of a fragment of lath-board embodying the invention; Fig. 2 is a perspective view of the underside of a fragment of the lath-board; Fig. 3 is a cross section. on line mm of Fig. 1.; Fig. 4 is asperspective view of the board shown secured upon a backing sheet and with re-. inforcingstrips upon the outer side only; Fig. 5 is a "perspective view of a fragment of the board shown with a modified form of corrugations; and Fig. 8 is an end view of the board shown in Fig. 5.

The lath-board of the present invention is made preferably of waterproofcd paper, such as rope stock surfaced or impregnated with asphalt or the like. The sheet is bent or molded under pressure to form corrugaions or alternate lath projections and depressions. In the form shown in Figs. 1, 2, and 3 of the drawings every other projection is of keyed lath shape, that is with its sides inclined downwardly and inwardly toward each other, such as the projections 2, while alternating with these rojections are lath projections? having their sides inclined outwardly auapf'rom each other. Between the lath projections are depressions or recesses located in the angles between the inwardly inclined sides ofthe projections 2 and the outwardly inclined sides of the adjacent rojections 3. Bcreth each keyed lath projection 2 .1 L mnqazla. air space c m tracting toward the bottom, and beneath each projection 3 is an air space 6 spreading or widening toward the bottom.

If desired all of the lath projections and depressions may be made of keyed lath shape form, as shown in Figs. 5 and 6, Where 7 represents the stamped up lath projections and 8 the intermediate depressions adapted to receive and hold the plaster. As in the forms shown in Figs. 1 and 3 the spaces beneath the lath projections serve as heat insulating and sound deadening spaces. To hold the corrugations to form, that is to prevent them from becoming flattened or crushed in use, as well as to provide means for preventing the plaster from slipping I incorporate in the board reinforcement strips 9 and 10, preferably of sheet metal. These strips extend transversely across the corrugations upon the outer and innersides thereof, respectively, at spaced intervals and are bent to follow the corrugations of the sheet. The strips may be first laid on the sheets and then corrugated with the sheets and in the same operation, or they may be first molded by an independent operation and then slipped endwise' over the corru ations. It .will be seen that these strips 01- lowing closely the bends and folds of the corrugations and fitting snugl against the surfaces of the board will e ectually hold the corrugations to form. It is ordinarily sufficient to provide the reinforcing strips upon oiie side only of the board using referahly the strips 9 upon the outer si e of the board, rather than the strips 10 upon the unders'de of the board as the strips upon the outer ide hold the corrugations better to form, also afford locks to prevent the plaster from slipping.

If desired the corrugated sheet may be placed upon a suitable backing sheet 11 and made to adhere to it by asphalt or other suitable binding means, as shown in'Fig. 5, or be secured thereto by means of staples 12 as shown in F ig. 4. The reinforcing strips 9 and 10 extending transversely of the board and bent or corrugated to follow the corrugations thereof constitute an easily applied and particularly effective means of holding the corrugations t0 fornnand, when placed on the outer side of the board, serve to prevent the plaster from slipping.

I claim: I

-1. A latlrbourd comprising flexible mate a sheet of xii corrugated to form inter.-

spaced lath projections, and intermediate depressions, and reinforcing strips extending across the sheet transversely of the corrugations and corrugated to conform to the corrugations of the sheet, whereby to hold the corrugations of the sheet to form.

2. A lath-board comprising a sheet of flexible material corrugated to form interspaced lath projections and intermediate de- 10 pressions and reinforcing strips extending across the sheet transversely of the corrugations on both outer and inner sides thereof and being themselves corrugated to conform to the corrugations of the sheet.

In testimony whereof I afiix my signature 15 in presence of two Witnesses.

SILAS M. FORD.- \Vitnesses ARTHUR P. LoTHRoP, H. SWANSON. 

